CSEMP assessment of lead in biota at New Brighton (Mersey)
Statistical analysis
Trend assessment
Analysis of variance
| | Df | AIC | AICc | Log lik | Deviance | Chisq | Chi df | Pr(>Chisq) |
| mean | 1 | 31.64 | 34.21 | -12.82 | 25.64 | | | |
| linear | 2 | 23.41 | 28.74 | -7.70 | 15.41 | 10.233 | 1 | 0.0014 |
| smooth (df = 2) | 3 | 25.39 | 35.39 | -7.70 | 15.39 | 0.013 | 1 | 0.9078 |
| smooth (df = 3) | 4 | 20.64 | 38.64 | -4.32 | 8.64 | 6.751 | 1 | 0.0094 |
Change in log concentration
| | Year start | Year end | Fit start | Fit end | Change | Std error | t | Pr(>|t|) |
| overall | 2002 | 2018 | 7.391 | 6.242 | -1.1490 | 0.2717 | -4.230 | 0.0029 |
| last 20 years | 2002 | 2018 | 7.391 | 6.242 | -1.1490 | 0.2717 | -4.230 | 0.0029 |
Status assessment
| | Conc fitted | Conc ref | Log ratio | Std error | t | Pr(>t) |
| BAC | 513.6 | 211.9 | -0.8854 | 0.1546 | -5.726 | 0.9998 |
| EC | 513.6 | 1500.0 | 1.0717 | 0.1546 | 6.930 | <0.0001 |
Raw data with supporting information
Raw data with assessment
Assessment plot
Metals data
Metals assessment
Related pages
- Clean Seas Environment Monitoring Programme (CSEMP) accessment viewer tool
- Assessment methodology for metals in biota
- Accessment criteria for metals in biota
